I n the paper which I had the honour to bring before the Society in the early part of last year, on Annelid jaws from the Palæozoic rocks of Canada and Scotland*, I ventured to express an opinion that these small bodies would be very likely found in rocks of similar age in this country. Since that time I have had the opportunity of searching various exposures of the Silurian rocks at Dudley, Much Wenlock, and Iron Bridge, in Shropshire, all well-known localities for Wenlock fossils ; and in each place I have discovered Annelid jaws more or less abundantly. In quarries at Stoke-Edith, and near Ludlow, the rocks of Upper Ludlow age also yielded these remains, though by no means so abundantly or in such a good state of preservation as the Wenlock rocks—a result perhaps rather owing to the less favourable character of the matrix for their preservation and to the more limited exposures of the rock-surfaces than to any deficiency in the number of the Annelids. Altogether, from the above-mentioned localities my search produced between two and three hundred specimens of these minute remains : but the greater number of these proved on examination to be only fragmentary specimens ; many perish in the process of cleaning them away from the matrix ; and thus only about one fourth of the total number are available for description. It is a matter of surprise that these fossils, occurring thus numerously in a district renowned as a classical hunting-ground for